380580-en-US_v2.6 6/20
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Introduction
Congratulations on your purchase of Extech’s Model 380580 Battery Powered Milliohm Meter. This
device offers five resistance ranges with resolution as low as 0.1m
. The 4-wire Kelvin clip connection
ensures optimum accuracy. Typical applications include transformer, motor coil, and PC Board
resistance measurements. This professional meter, with proper care, will provide years of safe reliable
service.
Meter Description
1. Current Terminals
2. Potential Measurement Terminals
3. LCD Display
4. Start/Stop Test Button
5. Range Select/Power Switch
6. LED Error Lights
• No Test/Over Temperature
• R
P
Voltage Regulation
• R
C
Current Regulation
7. Current/Range Table
Leads
Current Leads- Banana plug to alligator clip
C1- Green
C2- Blue
Voltage Potential Leads- Banana plug to alligator clip
P1- Red
P2- Black
Kelvin Clips- Banana Plugs (2) to Kelvin Clip
Red (P1) Green (C1)
Black (P2) and Blue (C2)
Measurement Considerations
1. Do not apply voltage to the meter input terminals. Meter damage may result.
2. Always insure that the circuit to be measured is switched OFF, isolated and completely de-
energized before connecting the test leads.
3. If the Over Temperature LED (NO TEST) indicator is lit, allow the instrument to cool down
before proceeding further.
4. The R
C
led indicates when the test current falls out of regulation. Selecting a higher range
may eliminate the condition.
5. The R
P
led indicates when the voltage on the device under test is too high. Selecting a lower
range may eliminate the condition.
6. If either the R
C
or R
P
led is on, the measurement may be in error.
7. The current terminals are fuse protected.
8. Keep the potential test leads as short as possible. Long leads may introduce noise.
9. When using the four separate alligator clip leads always place the current leads outside the
potential leads.
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